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1 Service Manual Trucks Group 36 Vehicle Electronic Control Unit (MID 144), Diagnostic Trouble Code (DTC), Guide From build date PV

2 Foreword The descriptions and service procedures contained in this manual are based on designs and methods studies carried out up to January The products are under continuous development. Vehicles and components produced after the above date may therefore have different specifications and repair methods. When this is believed to have a significant bearing on this manual, supplementary service bulletins will be issued to cover the changes. The new edition of this manual will update the changes. In service procedures where the title incorporates an operation number, this is a reference to a Labor Code (Standard Time). Service procedures which do not include an operation number in the title are for general information and no reference is made to a Labor Code (Standard Time). Each section of this manual contains specific safety information and warnings which must be reviewed before performing any procedure. If a printed copy of a procedure is made, be sure to also make a printed copy of the safety information and warnings that relate to that procedure. The following levels of observations, cautions and warnings are used in this Service Documentation: Note: Indicates a procedure, practice, or condition that must be followed in order to have the vehicle or component function in the manner intended. Caution: Indicates an unsafe practice where damage to the product could occur. Warning: Indicates an unsafe practice where personal injury or severe damage to the product could occur. Danger: Indicates an unsafe practice where serious personal injury or death could occur. Mack Trucks, Inc. Greensboro, NC USA Order number: PV Repl: 2010 Mack Trucks, Inc., Greensboro, NC USA All rights reserved. No part of this publication may be reproduced, stored in retrieval system, or transmitted in any forms by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Mack Trucks, Inc. USA39418

3 Contents Design and Function. 3 MID 144 Vehicle Control Unit. 3 Troubleshooting

5 MID 144 Vehicle Control Unit MID 144 Vehicle Control Unit The manufacturer diagnostic tool is the preferred tool for performing diagnostic work. Contact your local dealer for more information or visit Design and Function System Overview The Vehicle Electronic Control Unit (VECU) is a microprocessor based controller, programmed to perform several functions, these include: Driver controls Vehicle and engine speed controls Starter control Cab power Broadcasting data on the serial data lines Trip data logging Diagnostic fault logging and password processing The VECU performs these functions by monitoring the signals from sensors and switches, and data received over the serial data lines from the other modules. The VECU directly monitors the Throttle Position (TP) Sensor and Vehicle Speed Sensor (VSS). vehicle operator will be advised that a fault has occurred by the illumination of a malfunction indicator lamp and a message in the driver information display, if equipped. When diagnosing an intermittent code or condition, it may be necessary to use a diagnostic computer connected to the Serial Communication Port. Additional data and diagnostic tests are available when a diagnostic tool is connected to the Serial Communication Port. For diagnostic software, contact your local dealer or visit The VECU also monitors the position or state of multiple switches, to perform its control and diagnostic functions. The switches include: A/C Pressure Switch Air Suspension Height Control Switch Differential Lock Switch Engine Brake Switches Ignition Key Switch PTO Switches (if equipped) Service and Park Brake Switches Speed Control Switches (Set/Decel, Resume/Accel) 5th Wheel Slide Switch The VECU communicates with other modules and shares its inputs through the SAE J1939 high speed data link as well as the SAE J1587 normal speed data link. The SAE J1587 data link is primarily used for programming, diagnostics and data reporting. In addition to switch and sensor data, the broadcast between modules also includes various calculations and conclusions each module has developed, based on the input information it has received. These calculations and conclusions are part of the modules on-board diagnostic capability. The on-board diagnostics are designed to detect faults or abnormal conditions that are not within normal operating parameters. When the system detects a fault or abnormal condition, the fault will be logged in one or both of the modules memory, the 3

6 The manufacturer diagnostic tool is the preferred tool for performing diagnostic work. Contact your local dealer for more information or visit The control modules on the SAE J1587 data link communicate according to the SAE J1587 standard. The standard has been extended with Mack s supplement (PPID, PSID). The fault codes set by the control modules contain information that is described by the following abbreviations. Troubleshooting MID Message Identification Description: Identification of a control module. SID Subsystem Identification Description: Identification of a component. PID PPID Parameter Identification Description: Identification of a parameter (value). Proprietary Parameter Identification Description Mack: Unique identification of a parameter (value). PSID FMI Proprietary Subsystem Identification Description Mack: Unique identification of a component. Failure Mode Identifier: Identification of fault types. FMI Table FMI Display Text SAE Text 0 Too high value Data valid, but above the normal work range 1 Too low value Data valid, but below the normal work range 2 Incorrect data Data erratic, Intermittent or incorrect 3 Electrical fault Voltage above normal or shorted high 4 Electrical fault Voltage below normal or shorted low 5 Electrical fault Current below normal or open circuit 6 Electrical fault Current above normal or grounded circuit 7 Mechanical fault Mechanical system not responding properly 8 Mechanical or electrical fault Abnormal frequency, pulse width or period 9 Communication fault Abnormal update rate 10 Mechanical or electrical fault Abnormal rate of change 11 Unknown fault Failure mode not identifiable 12 Component fault Bad intelligent device or component 13 Incorrect calibration Out of calibration 14 Unknown fault Special instructions 15 Unknown fault Reserved for future assignment by SAE Data Formal Subcommittee 4

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7 MID 144 Vehicle ECU, Fault Codes PID MID 144 PID 83 Road Speed Limit Status, page 7 MID 144 PID 84 Vehicle Speed, page 7 MID 144 PID 86 Cruise Control, Set Speed, page 7 MID 144 PID 91 Accelerator Pedal Position (Percentage), page 8 MID 144 PID 152 Vehicle ECU, Number of Resets, page 8 MID 144 PID 191 Output Shaft Speed, page 8 PPID MID 144 PPID 3 Starter relay Output, page 9 MID 144 PPID 60 Idle Validation Switch, Power, page 9 MID 144 PPID 69 Buffered Idle Validation Switch, page 9 MID 144 PPID 70 Pedal Switches, Supply, page 9 MID 144 PPID 71 Cruise Control and Engine Brake, Switch Supply, page 9 MID 144 PPID 72 Accelerator Pedal and Engine Brake, Sensors Supply, page 10 MID 144 PPID 73 Second Accelerator Pedal, Supply Sensors, page 10 MID 144 PPID 74 Vehicle ECU, Power Supply, page 11 MID 144 PPID 265 Vehicle Speed Sensor Supply, page 11 MID 144 PPID 279 Air dryer, Dry Agent Reservoir, page 11 MID 144 PPID 312 Air Dryer, Regeneration, page 11 MID 144 PPID 430 Air Dryer, Regeneration, page 12 SID MID 144 SID 230 Idle Validation Switch 1, page 12 MID 144 SID 231 SAE J1939 Data Link, page 12 MID 144 SID 240 Program Memory, page 12 MID 144 SID 243 Cruise Control Set Switch, page 12 MID 144 SID 250 SAE J1587 Data Link, page 13 MID 144 SID 253 Calibration Memory EEPROM, page 13 5

8 PSID MID 144 PSID 1 Retarder Control Set Switch, page 13 MID 144 PSID 2 Idle Validation Switch 2, page 13 MID 144 PSID 4 Engine Brake Stalk Lever, page 14 MID 144 PSID 8 Neutral Position Error, page 14 MID 144 PSID 14 DataMax General Error, page 14 MID 144 PSID 16 Power Relay 1, page 14 MID 144 PSID 17 Power Relay 2, page 15 MID 144 PSID 20 Power Take-off Signal, page 15 MID 144 PSID 23 Air Dryer, Regenerating, page 15 MID 144 PSID 24 Compressor, Control, page 15 MID 144 PSID 25 Air Leakage, page 16 MID 144 PSID 200 Communication Interference, Data Link, Engine Control Module (ECM), page 16 MID 144 PSID 202 Communication Interference, Data Link, Instrumentation, page 16 MID 144 PSID 204 Communication Interference, Data Link, Brake Control Module, page 16 MID 144 PSID 205 Communication Interference, Data Link, Transmission Control Module, page 17 MID 144 PSID 206 Communication Interference, Data Link, Retarder Control Module, page 17 MID 144 PSID 207 Communication Interference, Data Link, Gear Selector Control Module, page 17 MID 144 PSID 208 Communication Interference, Data Link, Air Suspension, page 17 MID 144 PSID 210 SAE J1939 Data Link Interruption, Lighting Control Module (LCM), page 17 MID 144 PSID 211 SAE J1939 Data Link Interruption, Collision Avoidance Control Module, page 18 MID 144 PSID 214 Data Link, Bodybuilder Control Module, page 18 MID 144 PSID 230 Software Fault, page 18 6

9 MID 144 PID 83 Road Speed Limit Status FMI 14 Special instructions Low air suspension road speed limit exceeded (Driver exceeded limit with Air Suspension lowered) Exceeding road speed limit with air suspension lowered MID 144 PID 84 Vehicle Speed FMI 2 Intermittent or incorrect data Speed signal from speedometer and ABS differs too much Gauge drops/inoperable Incorrect road speed displayed in cluster VSS Harness VSS Sensor Wrong K-factory value (MG and MH parameter in VECU) ABS reported speed missing or inconsistent FMI 5 Current below normal or open circuit Sensor open or shorted to ground Incorrect road speed displayed in cluster VSS Harness/connector VSS Sensor FMI 6 Current above normal or grounded circuit Short across sensor Incorrect road speed displayed in cluster VSS Harness/connector VSS Sensor FMI 14 Special instructions Intermittent faulty data Speed signal from VSS was updated incorrectly Incorrect road speed displayed in cluster SAE J1587 data link Wiring harness MID 144 PID 86 Cruise Control, Set Speed FMI 14 Special Instructions Timeout on ACC1 message with adamptive cruise installed Faulty or no info from ACC (VORAD) Wiring harness 7

10 MID 144 PID 91 Accelerator Pedal Position (Percentage) FMI 5 FMI 6 circuit to higher current or open circuit current or short circuit to ground Voltage above 4.3V Voltage below 0.4V Input too low compared to IVS1 & IVS2 Input to low compared to IVS1 & IVS2 Engine will not supply requested fuel to engine Engine will not supply requested fuel to engine Engine will not supply requested fuel to engine Engine will not supply requested fuel to engine Accelerator pedal position harness shorted high Faulty accelerator pedal position sensor Accelerator pedal position harness shorted low Faulty accelerator pedal position sensor Loss of sensor signal Faulty accelerator pedal position sensor Faulty accelerator pedal position sensor Loss of sensor ground FMI 14 Special Instructions Supply Error from PPID 72 Engine will not supply requested fuel to engine Accelerator pedal position harness MID 144 PID 152 Vehicle ECU, Number of Resets FMI 12 Faulty module or component Internal software fault causing a reset System restarted VECU MID 144 PID 191 Output Shaft Speed 8 FMI 5 FMI 6 current or open circuit current or short circuit to ground Lower current then expected Higher current then expected Faulty vehicle speed sensor (VSS) Wiring harness Faulty vehicle speed sensor (VSS) Wiring harness

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11 MID 144 PPID 3 Starter relay Output Voltage above normal or shorted high Excessive current through drive circuitry Short in harness or drive relays MID 144 PPID 60 Idle Validation Switch, Power Lower then expected Wiring harness VECU Defective idle validation switch Loss of power supply to the idle validation switch MID 144 PPID 69 Buffered Idle Validation Switch circuit to higher Buffered IVS1 too high compared to IVS1 signal Signal shorted high Buffered IVS1 too low compared to IVS1 signal Signal shorted low MID 144 PPID 70 Pedal Switches, Supply Voltage below 3V Faulty connector Supply shorted low MID 144 PPID 71 Cruise Control and Engine Brake, Switch Supply Voltage below 3V lamp lit Engine will not supply requested fuel increase Faulty connector Supply shorted low 9

12 MID 144 PPID 72 Accelerator Pedal and Engine Brake, Sensors Supply circuit to higher Voltage above 5.7V Requested fuel not supplied to engine Engine brake retarder is disabled Accelerator pedal position sensor harness shorted high Accelerator pedal position sensor Voltage below 4.7V Requested fuel not supplied to engine Engine brake retarder is disabled Accelerator pedal position sensor harness shorted low Accelerator pedal position sensor MID 144 PPID 73 Second Accelerator Pedal, Supply Sensors circuit to higher Voltage above 5.3V Engine will not supply requested fuel to engine Display show minimum wet tank pressure Signal shorted to high Faulty tank air pressure sensor Voltage below 4.7V Engine will not supply requested fuel to engine Display show minimum wet tank pressure Signal shorted low Faulty tank air pressure sensor 10

13 MID 144 PPID 74 Vehicle ECU, Power Supply Voltage below 4.7V Engine will not supply requested fuel to engine Display show minimum wet tank pressure Signal shorted low Faulty tank air pressure sensor MID 144 PPID 265 Vehicle Speed Sensor Supply circuit to higher Voltage above 9V VSS harness shorted high Faulty VSS Voltage below 6.5V VSS harness shorted low Faulty VSS MID 144 PPID 279 Air dryer, Dry Agent Reservoir FMI 0 Data valid, but above the normal working range Air volume too high pumping through the air cartridge Air cartridge valves may be hard to handle Air Filter MID 144 PPID 312 Air Dryer, Regeneration FMI 0 Data valid, but above the normal working range Airflow used is to high to get time to regenerate Reduced air pump ability Air Filter Plain air leakage ECS FMI 7 Incorrect response from a mechanical system Valve have been open for 30 seconds and the pressure is still the same Valve block stuck open Air filter 11

14 MID 144 PPID 430 Air Dryer, Regeneration FMI 0 Data valid, but above the normal working range Airflow used is too high to get time to regenerate Reduced air pump ability Air suspension regulates too much Air leak Air Filter MID 144 SID 230 Idle Validation Switch 1 FMI 7 Incorrect response from a mechanical system Faulty readout from IVS1 Engine will not supply requested fuel to engine Idle Validation Switch (IVS) IVS connector IVS harness Loss of ground to the accelerator pedal sensor MID 144 SID 231 SAE J1939 Data Link FMI 2 Intermittent or incorrect data VECU doesn t get acknowledge on sent messages CAN communication SAE J1939 data link down/shorted MID 144 SID 240 Program Memory FMI 2 Intermittent or incorrect data Check sum calculated at startup differs from the stored one ECU keeps resetting Vehicle not drivable Software error Faulty flash hardware VECU MID 144 SID 243 Cruise Control Set Switch FMI 7 Incorrect response from a mechanical system Signals SET+ and SET- received at the same time Cruise control deactivated Connector 12

15 MID 144 SID 250 SAE J1587 Data Link FMI 2 Intermittent or incorrect data Faulty messages on the link received Some function disturbances may occur SAE J1587 data link down/shorted MID 144 SID 253 Calibration Memory EEPROM FMI 2 Intermittent or incorrect data Datasets have incorrect checksum Some functions may be deactivated Faulty EEPROM VECU FMI 14 Special instructions Incorrect data found in datasets Error when programming Some functions may be deactivated Faulty EEPROM VECU MID 144 PSID 1 Retarder Control Set Switch FMI 7 Incorrect response from a mechanical system Signals SET+ and SET- received at the same time Retarder Control deactivated Connector MID 144 PSID 2 Idle Validation Switch 2 FMI 7 Incorrect response from a mechanical system Faulty readout from IVS2 Engine will not supply requested fuel to engine Idle Validation Switch (IVS) IVS connector IVS harness 13

16 MID 144 PSID 4 Engine Brake Stalk Lever circuit to higher Voltage above 4.8V Retarder deactivated Connector Voltage below 0.2V Retarder deactivated Connector MID 144 PSID 8 Neutral Position Error Neutral input shorted high or switch stuck closed Neutral switch MID 144 PSID 14 DataMax General Error FMI 9 Abnormal update rate Clock or Other data missing MID 144 PSID 16 Power Relay 1 circuit to higher Power relay 1 output shorted to battery EMS power relay Power relay 1 output shorted to ground EMS power relay 14

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17 MID 144 PSID 17 Power Relay 2 circuit to higher Power relay 2 output shorted to battery EMS power relay Power relay 1 output shorted to ground EMS power relay MID 144 PSID 20 Power Take-off Signal circuit to higher Voltage too high Circuit shorted high Faulty Harness Faulty Valve Voltage below 2.3V Circuit shorted low Faulty Harness Faulty Valve MID 144 PSID 23 Air Dryer, Regenerating circuit to higher Voltage too high Signal shorted low Faulty valve Voltage below 2.3V Signal shorted high Faulty valve MID 144 PSID 24 Compressor, Control circuit to higher Voltage too high Signal shorted low Faulty valve Voltage below 2.3V Signal shorted high 15

18 Faulty valve MID 144 PSID 25 Air Leakage FMI 14 Data valid, but below the normal working range AIrflow too high (at velocity above 50km/h) Small Leakage — Info Large Leakage — Service Air leakage MID 144 PSID 200 Communication Interference, Data Link, Engine Control Module (ECM) FMI 9 Abnormal update rate Expected EMS message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted Inconsistent or mismatch of configuration between VECU and Engine Control Module (ECM) MID 144 PSID 202 Communication Interference, Data Link, Instrumentation FMI 9 Abnormal update rate Expected Cluster message/s not received CAN1 Communication Down SAE J1939 datalink Down/Shorted MID 144 PSID 204 Communication Interference, Data Link, Brake Control Module FMI 9 Abnormal update rate Expected ABS message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted VECU is configured to receive J1939 HRW message (High Resolution Wheel Speed) from ABS but isn t receiving it 16

19 MID 144 PSID 205 Communication Interference, Data Link, Transmission Control Module FMI 9 Abnormal update rate Expected TECU message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted MID 144 PSID 206 Communication Interference, Data Link, Retarder Control Module FMI 9 Abnormal update rate Expected ECCU retarder message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted MID 144 PSID 207 Communication Interference, Data Link, Gear Selector Control Module FMI 9 Abnormal update rate Expected GSECU message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted MID 144 PSID 208 Communication Interference, Data Link, Air Suspension FMI 9 Abnormal update rate Expected ECS message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted MID 144 PSID 210 SAE J1939 Data Link Interruption, Lighting Control Module (LCM) FMI 9 Abnormal update rate Expected LCM message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted 17

20 MID 144 PSID 211 SAE J1939 Data Link Interruption, Collision Avoidance Control Module FMI 9 Abnormal update rate Expected ACC message/s not received CAN1 Communication Down SAE J1939 data linke Down/Shorted MID 144 PSID 214 Data Link, Bodybuilder Control Module FMI 9 Abnormal update rate Expected BBM message/s not received CAN1 Communication Down SAE J1939 data link Down/Shorted MID 144 PSID 230 Software Fault FMI 5 FMI 12 current or open circuit Faulty module or component Uncontrolled reset of SW Software has been shutdown because too low Severe error reset the Software Wiring harness (loss or interruption of supply ) Faulty software VECU Wiring harness (loss or interruption of supply ) Faulty software VECU 18

22 Last page PV (USA) Mack Trucks, Inc., 2010 Mack Trucks, Inc. Greensboro, NC USA

FMI 14 – Special instructions

Fault code explanation:

DCU: Engine warning in DCU display. CIU: Flash code

Electrical fault: 9.9 (EMS) Value fault: None (EMS)

Electrical fault: 9.8 (CIU) Value fault: None (CIU)

Engine does not start.

• Internal fault in control unit.

1 Reprogram the unit which set the faultcode.

2 Change the unit which set the faultcode.

FMI 8 – Abnormal frequency, pulse width or period FMI 12 – Faulty device or component

Fault code explanation:

Electrical fault: 9.9 (EMS) Value fault: None (EMS)

Electrical fault: 9.8 (CIU) Value fault: None (CIU)

• If faultcode MID 144, SID 254, FMI 11 appears the CIU throttle positive and negative supply wire could be short circuited to eachother.

• Faulty EEPROM, CIU.

• Faulty flash memory, CIU.

• Fault in control unit, CIU.

1 Check for short circuit in the supply cables to the CIU throttle potenti- ometer.

2 Reprogram the unit which set the faultcode.

Fault code explanation:

DCU: Engine warning in DCU display. CIU: None.

Electrical fault: None. Value fault: None.

Conditions for fault code:

No communication with the engine control unit.

• An open circuit in CAN H or CAN L or both CAN links between EMS 2 and DCU/CIU.

• An open circuit in Power supply 0V cable between EMS 2 and DCU/ CIU.

• An open circuit in Power supply input cable between EMS 2 and DCU/ CIU.

• CAN H short circuited to power supply in pin 4.

1 Check contact pressure in socket 51 and 55 in engine connector B.

2 Check for an open circuit or short circuit between cables in the cable harness between the DCU/CIU and EMS 2, via the engine connector.

Источник: autobryansk.info

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